PROCESSING UNIT AND PROCESSING MACHINE FOR PROCESSING A WORKPIECE WALL OF A WORKPIECE, AND METHOD FOR PRODUCING SUCH A PROCESSING UNIT

Abstract

A processing unit for processing a workpiece wall of a workpiece with a forward stroke carried out by the processing unit in a forward stroke direction of the processing unit towards the workpiece, and with a backward stroke carried out by the processing unit in a backward stroke direction of the processing unit away from the workpiece, wherein the workpiece and the processing unit move relative to each other along a working axis of the processing unit. A processing machine for processing a workpiece wall of a workpiece contains the processing unit.

Claims

1. A processing unit for processing a workpiece wall of a workpiece (7), with relative movement of the workpiece (7) and the processing unit along a working axis (8) of the processing unit, with a forward stroke carried out by the processing unit in a forward stroke direction (9) of the processing unit towards the workpiece (7), and with a backward stroke carried out by the processing unit in a backward stroke direction (10) of the processing unit away from the workpiece (7), the processing unit comprising: a machine tool (3) for processing the workpiece wall, wherein the machine tool (3) is in contact with the workpiece (7) during the forward stroke and during the backward stroke of the processing unit, a tool support (4) which is provided for the machine tool (3), and which has a forward stroke bearing surface (11) on the support pointing in the forward stroke direction (9), and a backward stroke bearing surface (13) on the support which is spaced from the forward stroke bearing surface (11) on the support along the working axis (8) of the processing unit and which points in the backward stroke direction (10), wherein the machine tool (3) is arranged in front of the forward stroke bearing surface (11) on the support in the forward stroke direction (9), and wherein the machine tool (3) is supported on the forward stroke bearing surface (11) on the support in the opposite direction of the forward stroke direction (9) during the forward stroke of the processing unit, and is supported on the backward stroke bearing surface (13) on the support in the opposite direction of the backward stroke direction (10) during the backward stroke of the processing unit, and a clamping device (5) configured for clamping the machine tool (3) along the working axis (8) against the forward stroke bearing surface (11) on the support and against the backward stroke bearing surface (13) on the support, wherein the backward stroke bearing surface (13) on the support is spaced apart on the tool support (4) from the forward stroke bearing surface (11) on the support in the backward stroke direction (10), and faces away from the forward stroke bearing surface (11) on the support, wherein the clamping device (5) comprises a tension element (14) which is structurally separate from the tool support (4), which extends along the working axis (8), and which is connected along the working axis (8) to the machine tool (3) on one end, and on the other end has an adjusting thread (19a) with which an adjusting element (15) of the clamping device (5) is in threaded engagement, wherein, when the machine tool (3) is opposite the forward stroke bearing surface (11) on the support along the working axis (8), the adjusting element (15) of the clamping device (5) is opposite, along the working axis (8), the backward stroke bearing surface (13) on the support facing away from the forward stroke bearing surface (11) on the support, wherein the tension element (14) of the clamping device (5), which is structurally separate from the tool support (4), can be subjected to tensile preload along the working axis (8), and wherein, when the tension element (14) of the clamping device (5) is preloaded along the working axis (8), the backward stroke bearing surface (13) on the support facing away from the forward stroke bearing surface (11) on the support is loaded by the adjusting element (15) of the clamping device (5) along the working axis (8) in the direction of the machine tool (3), and the machine tool (3) is clamped along the working axis (8), against the forward stroke bearing surface (11) on the support and against the backward stroke bearing surface (13) on the support, by means of the adjusting element (15) and the tension element (14) of the clamping device (5) subjected to tension.

2. The processing unit according to claim 1, wherein the tension element (14) of the clamping device (5) can be subjected to tensile preload along the working axis (8) by a rotary actuation of the adjusting element (15) of the clamping device (5) in a tensioning direction of rotation.

3. The processing unit according to claim 1, further comprising a tensioning device (23) that is configured for subjecting the tension element (14) of the clamping device (5) to tensile preload along the working axis (8), wherein the tension element (14) can be subjected to tension by means of the tensioning device (23) when the machine tool (3) is supported on the forward stroke bearing surface (11) on the support, wherein, when the tension element (14) is subjected to tension by means of the tensioning device (23), the adjusting element (15) can be moved into a target position on the tension element (14) along the working axis (8) by rotary actuation, and wherein, when the adjusting element (15) is arranged in the target position, the tensile load subjected to the tension element (14) by the tensioning device (23) can be cancelled, and thereby the backward stroke bearing surface (13) on the support facing away from the forward stroke bearing surface (11) on the support can be loaded by the adjusting element (15) of the clamping device (5) along the working axis (8) in the direction of the machine tool (3).

4. The processing unit according to claim 3, wherein the tension element (14) has a coupling device for connecting the tension element (14) to a tension member (27) of the tensioning device (23), which can be loaded in a tensioning direction (28).

5. The processing unit according to claim 4, wherein a coupling thread (19b) is provided as the coupling device of the tension element (14) for producing a threaded connection to the tension member (27) of the tensioning device (23).

6. The processing unit according to claim 1, wherein the tension element (14) is designed as a pull rod.

7. The processing unit according to claim 1, wherein the tool support (4) is designed as a hollow body, and has a receptacle (16) for the tension element (14) extending along the working axis (8).

8. The processing unit according to claim 1, wherein the tension element (14) is connected to the machine tool (3) with a form fit.

9. The processing unit according to claim 1, wherein the adjusting element (15) of the clamping device (5) is designed as an adjusting nut, and has an outer contour adapted to an operating tool.

10. The processing unit according to claim 1, wherein the tool support (4) is limited in the backward stroke direction (10) by the backward stroke bearing surface (13) on the support.

11. The processing unit according to claim 1, wherein the processing unit comprises a coupling element (29) which is arranged on the side of the tool support (4) pointing in the backward stroke direction (10), and is connected, to the tool support (4), and in that the coupling element (29) is designed to connect the processing unit to a processing drive (34) by means of which the relative movement of the workpiece (7) and the processing unit along the working axis (8) can be generated.

12. The processing unit according to claim 11, wherein the tool support (4) and the coupling element (29) are functionally connected to each other, preferably screwed, in a form-fitting manner along the working axis (8), wherein the tool support (4) has a stop surface (22) on a side facing the coupling element (29), extending transversely to the working axis (8), and a bolt-like threaded projection (21) which is stepped back transverse to the working axis (8) relative to the stop surface (22) on the support, which protrudes along the working axis (8) towards the coupling element (29), which is provided with an external thread (20), and which forms, on an end face pointing in the backward stroke direction (10), the backward stroke bearing surface (13) on the support, wherein the coupling element (29), on a side facing the tool support (4), has a bolt receptacle (32) extending along the working axis (8), provided with an internal thread for the threaded projection (21) of the tool support (4), and also a stop surface (33) of the coupling element which stop surface (33) projects transverse to the working axis (8) relative to the bolt receptacle (32), and wherein the tool support (4) and the coupling element (29) are screwed together, with mutual loading of the tool support (4) and the coupling element (29) along the working axis (8) on the stop surface (22) of the support and on the stop surface (33) of the coupling element.

13. A processing machine for processing a workpiece wall of a workpiece (7), having a processing unit (1) and having a processing drive (34) by means of which the workpiece (7) and the processing unit (1) can be moved relative to each other along a working axis (8) of the processing unit (1), with a forward stroke executed by the processing unit (1) in a forward stroke direction (9) of the processing unit (1) towards the workpiece (7), and with a backward stroke executed by the processing unit (1) in a backward stroke direction (10) of the processing unit (1) away from the workpiece (7), wherein the processing unit (1) is designed according to claim 1.

14. A method for producing a processing unit (1) according to claim 3, comprising; functionally supporting the tool support (4) of the processing unit (1) is on a support (25) of the tensioning device (23) in the backward stroke direction (10), connecting the tension element (14) of the clamping device (5) is to a tension member (27) of the tensioning device (23) on the side pointing in the backward stroke direction (10), subjecting the tension element (14) connected to the tension member (27) of the tensioning device (23) to tension in the backward stroke direction (10) by means of the tension member (27) of the tensioning device (23) loaded in a tensioning direction (28) when the tool support (4) is supported in the backward stroke direction (10) on the support (25) of the tensioning device (23) and when the tension element (14) is supported by the machine tool (3) on the forward stroke bearing surface (11) on the support in the backward stroke direction (10), moving the adjusting element (15) into a target position on the tension element (14) along the working axis (8) by rotary actuation when the tension element (14) is subjected to tension in the backward stroke direction (10) by means of the tension member (27) of the tensioning device (23), and wherein, when the adjusting element (15) is arranged in the target position, the tensile load subjected to the tension element (14) by the tension member (27) of the tensioning device (23) is canceled, and thereby the backward stroke bearing surface (13) of the tool support (4) is loaded by the adjusting element (15) of the clamping device (5) along the working axis (8) in the direction of the machine tool (3), and the machine tool (3) is clamped along the working axis (8) against the forward stroke bearing surface (11) on the support and against the backward stroke bearing surface (13) on the support, by means of the adjusting element (15) and the tension element (14) of the clamping device (5) subjected to a tensile preload.

15. The method according to claim 14, wherein the tension member (27) of the tensioning device (23), by means of which the tension element (14) of the clamping device (5) is subjected to tension in the backward stroke direction (10), is hydraulically loaded in the tensioning direction (28).

Description

[0034] In the following, the invention is explained in more detail using exemplary schematic illustrations. In the drawings:

[0035] FIG. 1a: is a sub-unit of a first embodiment of a processing for producing a toothing on a wall of a blind hole on a metallic workpiece,

[0036] FIG. 1b: is a sub-unit of a second embodiment of a processing unit for producing a toothing on a wall of a blind hole on a metallic workpiece,

[0037] FIG. 2: is the sub-unit according to FIG. 1b on a tensioning device when a preload is generated on a pull rod of the sub-unit, and

[0038] FIG. 3: is the first embodiment of the processing unit, comprising the sub-unit according to FIG. 1a.

[0039] In FIG. 1a, as part of a processing unit 1a sub-unit 2 is shown, which in turn comprises a machine tool 3, a tool support 4, and a clamping device 5.

[0040] The machine tool 3 is a conventional forming die made of hard metal, which is used to produce a toothing on a wall of a blind hole 6 in a metallic workpiece 7 indicated by dashed lines in FIG. 1a. For this purpose, the machine tool 3 is provided with a shaping toothing in the usual way. The teeth of the shaping toothing on the machine tool 3 run along a working axis 8 of the processing unit 1.

[0041] To produce the toothing on the wall of the blind hole 6, the processing unit 1 and the workpiece 7 are moved relative to each other along the working axis 8. A forward stroke carried out by the processing unit 1 in a forward stroke direction (arrow 9) towards the workpiece 7 is followed by a backward stroke of the processing unit 1 directed away from the workpiece 7 in a backward stroke direction 10.

[0042] During both the forward stroke and the backward stroke of the processing unit 1, the machine tool 3 is in contact with the wall of the workpiece 7. The forces acting on the machine tool 3 along the working axis 8 as a result of the processing are transferred to the tool support 4.

[0043] During the forward stroke of the processing unit 1, the machine tool 3 engaging in the wall of the blind hole 6 is supported on a forward stroke bearing surface 11 on the support opposite the forward stroke direction 9. In the same manner as a counter surface 12 of the machine tool 3 situated opposite the forward stroke bearing surface 11 of the tool support 4, the forward stroke bearing surface 11 on the support extends essentially perpendicular to the working axis 8.

[0044] During the backward stroke of the processing unit 1 in the backward stroke direction 10, the machine tool 3 in contact with the wall of the blind hole 6 is compelled to lift off the forward stroke bearing surface 11 of the tool support 4 along the working axis 8. This is prevented by a support of the machine tool 3, which acts in the opposite direction of the backward stroke direction 10, on a backward stroke bearing surface 13 on the support. The backward stroke bearing surface 13 on the support is spaced apart from the forward stroke bearing surface 11 on the support in the backward stroke direction 10, and faces away from the forward stroke bearing surface 11 on the support.

[0045] The support of the machine tool 3 on the backward stroke bearing surface 13 of the tool support 4 is not implemented directly, but rather via a pull rod 14 which is provided as a tension element and which is structurally separate from the tool support 4, and also via an adjusting element of the clamping device 5 that sits on the pull rod 14 and is designed as an adjusting nut 15.

[0046] The pull rod 14 of the clamping device 5 extends in a receptacle 16 of the tool support 4, which is designed as a hollow body, along the working axis 8. In the forward stroke direction 9, the pull rod 14 ends flush with the machine tool 3. Consequently, in the example shown, the machine tool 3, together with the end face of the pull rod 14 in the forward stroke direction 9, delimits the processing unit 1 in the forward stroke direction 9. Alternatively, the end face of the pull rod 14 in the forward stroke direction 9 can be set back opposite to the forward stroke direction 9 in relation to the end face of the machine tool 3 in the forward stroke direction 9. In both cases, the wall of the blind hole 6 can be formed over its entire axial length by means of the machine tool 3.

[0047] On the side positioned in the forward stroke direction 9, the pull rod 14 is positively connected to the machine tool 3. For this purpose, the cross section of the pull rod 14 expands to form a shoulder 17 of the pull rod running perpendicular to the working axis 8. The shoulder 17 on the pull rod 14 works together with a shoulder 18 on the tool, which also runs perpendicular to the working axis 8, in order to produce the form fit between the pull rod 14 and the machine tool 3.

[0048] The end of the pull rod 14 pointing in the backward stroke direction 10 is provided with an external pull rod thread 19. The external thread 19 on the pull rod forms an adjusting thread 19a with which the adjusting nut 15 of the clamping device 5 is in threaded engagement. By rotating the adjusting nut 15 about the working axis 8, the adjusting nut 15 can be displaced along the pull rod 14 either in the forward stroke direction 9 or in the backward stroke direction 10. Due to the self-locking design of the adjusting thread 19a, and the internal thread on the adjusting nut 15 that meshes with it, the adjusting nut 15 maintains a set position along the working axis 8 even when the adjusting nut 15 is subjected to a force along the working axis 8. The adjusting nut 15 is provided with an outer contour. With the help of a tool adapted to the outer contour of the adjusting nut 15, a rotary actuation of the adjusting nut 15 about the working axis 8 is possible.

[0049] An outer support thread 20 is provided on the end of the tool support 4 positioned in the backward stroke direction 10 on a bolt-like threaded projection 21 of the tool support 4. The end face of the threaded projection 21 pointing in the backward stroke direction 10 forms the backward stroke bearing surface 13 of the tool support 4. The threaded projection 21 has a reduced cross section compared to the part of the tool support 4 adjoining it in the forward stroke direction 9. As a result, an annular support surface 22, which is concentric with the threaded projection 21 and extends in the transverse direction of the working axis 8, is formed on the tool support 4.

[0050] A sub-unit 52 of a processing unit 51 shown in FIG. 1b differs from the sub-unit 2 according to FIG. 1a only by the constructive implementation of the form fit between the pull rod 14 of the clamping device 5 and the machine tool 3.

[0051] In the case of the sub-unit 52, instead of the cooperating shoulder 17 on the pull rod and the shoulder 18 of the sub-unit 2 on the tool, a pull rod cone 53 and a tool mating cone 54 are provided as mutually cooperating interlocking elements.

[0052] So that the machine tool 3 does not lift off the forward stroke bearing surface 11 on the support during the backward stroke of the processing unit 1, 51, executed relative to the workpiece 7, the pull rod 14 is preloaded with tension along the working axis 8. Due to the preload, the pull rod 14 pulls the machine tool 3 against the forward stroke bearing surface 11 on the support, and pulls the adjusting nut 15 against the backward stroke bearing surface 13 on the support.

[0053] A hydraulic tensioning device 23, as shown schematically in FIG. 2, is used to generate the preload of the pull rod 14 along the working axis 8.

[0054] The processes for generating the preload of the pull rod 14 of the processing unit 51 and/or the sub-unit 52 of FIG. 1b are explained with reference to FIG. 2. In a corresponding manner, the pull rod 14 of the processing unit 1 and/or the sub-unit 2 of FIG. 1a is preloaded by means of the tensioning device 23.

[0055] In a state in which the pull rod 14 of the adjusting device 5 is not, or is only slightly under tensile load along the working axis 8, the external thread 20 of the tool support 4 of the sub-unit 52 of the processing unit 51 is screwed into an internal thread of a threaded bore 24 on a part of the tensioning device 23 provided as a support 25 of the device. As a result, the tool support 4 is effectively supported on the support 25 of the device in the backward stroke direction 10. The clamping nut 15 seated on the pull rod 14 contacts the backward stroke bearing surface 13 of the tool support 4 without force, or under the effect of the slight preload of the pull rod 14.

[0056] In addition, the pull rod 14 of the sub-unit 52 is screwed into a threaded hole 26 on a tension member 27 of the tensioning device 23 via a portion of the pull rod external thread 19 provided as a coupling thread 19b, and is thereby connected to the tension member 27.

[0057] When the tool support 4 is supported on the support 25 of the device in the backward stroke direction 10, the tension member 27 of the tensioning device 23 connected to the pull rod 14 of the sub-unit 52 is then loaded in a tensioning direction illustrated in FIG. 2 by an arrow 28, which coincides with the backward stroke direction 10, and, due to the loading of the tension member 27 in the tensioning direction 28, the pull rod 14 supported on the tool support 4 at the opposite end via the machine tool 3 is subjected to tensile load in the backward stroke direction 10 of the processing unit 51 and/or sub-unit 52.

[0058] Due to the tensile load on the pull rod 14, the adjusting nut 15 of the clamping device 5 lifts off the backward stroke bearing surface 13 of the tool support 4, and the adjusting nut 15 can be moved into a previously defined target position on the pull rod 14 along the working axis 8 by rotating it about the working axis 8. This occurs without friction between the adjusting nut 15 and the backward stroke bearing surface 13 of the tool support 4 during the rotary actuation of the adjusting nut 15, which would make the rotary actuation of the adjusting nut 15 more difficult and which could impair the accuracy of the adjustment of the adjusting nut 15.

[0059] As soon as the adjusting nut 15 is advanced into the target position on the pull rod 14, the pull rod 14 is separated from the tension member 27 of the tensioning device 23. After the pull rod 14 has been separated from the tension member 27 of the tensioning device 23, as a result of the effect of the preload of the pull rod 14, the adjusting nut 15 acts on the backward stroke bearing surface 13 of the tool support 4, and the machine tool 3 acts on the forward stroke bearing surface 11 of the tool support 4.

[0060] The target position of the adjusting nut 15 on the pull rod 14 is defined in such a way that after the pull rod 14 has been separated from the tension member 27 of the tensioning device 23, a preload of the pull rod 14 is adjusted, and is of such a magnitude that during the backward stroke of the processing unit 51 executed as part of the processing of the workpiece 7, on the one hand, a lifting of the machine tool 3 from the forward stroke bearing surface 11 on the support is effectively prevented and, on the other hand, the resulting tensile load on the pull rod 14, which is the sum of the tensile load of the pull rod 14 caused by the backward stroke of the processing unit 51 and the previously adjusted preload of the pull rod 14, does not exceed the material-specific tensile strength of the pull rod 14.

[0061] In order to be able to make maximum use of the tensile strength of the pull rod 14, the tension member 27 of the tensioning device 23 is loaded hydraulically in the tensioning direction 28 in order to preload the pull rod 14. The hydraulic tensile load on the pull rod 14 enables the preload of the pull rod 14 to be adjusted to an exact amount. As a result, the preload of the pull rod 14 can be set to a maximum value in a functionally reliable manner, which does not lead to a breakage of the pull rod 14 even with the addition of the tensile load on the pull rod 14 caused by the processing procedure.

[0062] The sub-unit 52 with the tension rod 14 preloaded in the above manner is unscrewed from the support 25 of the tensioning device 23, and thereby separated from the tensioning device 23.

[0063] Subsequently, the sub-unit 52 is joined with an adapter provided as a coupling element so as to form the processing unit 51.

[0064] According to FIG. 3, a corresponding procedure is used in the manufacture of the processing unit 1. In the sub-unit 2, the pull rod 14 is first preloaded in the manner described above. Subsequently, the sub-unit 2 is connected with a coupling element designed as an adapter 29 so as to form the processing unit 1.

[0065] By means of the adapter 29, the processing unit 1 is fixed in a tool holder 30, indicated by dashed lines in FIG. 3, of a processing drive 34 of a processing machine designed as an axial forming machine 31. With the aid of the processing drive 34 of the axial forming machine 31, the forward stroke and the backward stroke of the processing unit 1 with respect to the workpiece 7 being processed are generated.

[0066] To connect the sub-unit 2 to the adapter 29, the tool support 4 and the adapter 29 are screwed together.

[0067] For this purpose, the threaded projection 21 of the tool support 4, which is provided with the external thread 20, is screwed in the manner of a screw bolt into an internal thread on the wall of a bolt receptacle 32 provided on the adapter 29. The protrusion of the tool support 4, protruding transverse to the working axis 8 of the processing unit 1 relative to the threaded projection 21, contacts a stop face 33 on the coupling element and/or on the adapter via its stop face 22 on the support, like a screw head.

[0068] Tightening the tool support 4 with a rotational movement of the tool support 4, supported in the axial direction on the adapter 29, relative to the adapter 29 leads to an elongation of the threaded projection 21 on the support screwed into the bolt receptacle 32 of the adapter 29. Since the support-side threaded projection 21 forms the backward stroke bearing surface 13 on the support for the adjusting nut 15 of the clamping device 5 on the end face pointing in the backward stroke direction 10, the elongation of the threaded projection 21 on the support causes via the adjusting nut 15 supported on the end face of the threaded projection 21 a slight tensile load and a preload of the pull rod 14 beyond the previously generated preload. This additional preload of the pull rod 14, caused by the assembly, must be taken into account when the preload of the pull rod 14 generated by the tensioning device 23 is set.